Quote Originally Posted by garyb View Post
Firstly I would have recommended the 63-500 series which is specifically designed for acrylic.
Use the chipload charts to figure your feed and rpm.
The standard of using 18000 rpm dates back to when spindles were fixed speed.
give me a call and I will help you through the numbers
Gary
Thanks for the info. I didn't see the 63-500s for some reason, but for sure I'm going to return the 56-650 (haven't opened it) and get a 63-530. Its half the price too.

Here's the chart I found:
http://www.onsrud.com/plusdocs/Doc/i...d_Hard_Plastic

So for the 63-530 the chip load should be .004-.006. If I go with .005 and apply the formula:
Feed Rate = RPM x # of cutting edges x chip load
I get:
25ipm @ 5000 rpm
60ipm @ 12000 rpm
72.5ipm @ 14500 rpm
90ipm @ 18000 rpm

Well that lowers my range of experimentation I need to do- but I still am not quite clear on how that applies to the cutting width. So I think I will take you up on your offer for a quick call. What time zone are you in?

Thanks!
Eric